Quartz plate and quartz resonator in which the quartz plate is used
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United States of America Patent
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Mar 31, 2015
Grant Date -
Jan 10, 2013
app pub date -
Jul 2, 2012
filing date -
Jul 4, 2011
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Abstract
An AT-cut quartz plate having chamfered ridge portions and an almost rectangular shape in planar view, wherein a resonance frequency is equal to or larger than 7 MHz and equal to or smaller than 9 MHz, lengths of long and short sides of the rectangular shape are equal to or larger than 1.5 mm and equal to or smaller than 2.4 mm, and equal to or larger than a frequency difference between primary vibration and sub-vibration is equal to or larger than 975 kHz and equal to or smaller than 1,015 kHz.
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